Circle Circle Circle

Radius

100

What is the radius of a circle with a diameter of 88?

r=44

200

How do find the radius if you only are given the circumference? 

Divide by pi (3.14) and 2

300

c=678 what is the radius 

108

400

Mary wanted to buy a placemat but the circumference has to be 65 cm. What is the radius of the required placemat?

r= 10.3503185

500

use 3.14 for pi

c= 66 ft

d= ________

r= ________

d= 21.01910/  r=10.50955414

Diameter

100

What is the diameter of a circle with a radius of 7.999?

D=15.998

200

What is the Diameter of a circle with the circumference of 7?

d= 2.22929936

300

What is the Diameter of a circle that has the circumference of 123456789? Round to the nearest thousandth.

D= 39,317,448.7

400

What is the Diameter or a circle if the radius is 12345? No calculators
 

24690

500

How do find the Diameter with only the radius is given?

multiply the radius by 2

Circumference

100

What is the circumference of a circle with a radius of 0.68?

4.3

200

How do find the circumference of a circle when you only have the diameter? 

 d x 3.14= C

300

The circumference of a circle is 29 and the radius is 7.  True or False 

False 

400

If the diameter of a circle is 5 what is the circumference?

15.7 

500

How do find the circumference if only the radius is given?

multiply the radius by 2 and 3.14 

r x 2 x 3.14

Area

100

What is the area formula for circle?

^{Pi times radius squared}

200

What is the area of a circle with a radius of 30 ft.

2826 ft²

300

The area of a circle with a 66in diameter is ___. 

3,419.46 in²

400

What is the area of the base of an 8in cake pan?

50.24 in²

500

DOUBLE JEOPARDY

What is the area of a circle with a circumference of 12.56yd?

Problemas de aplicación

100

The school is putting a circular mural in the front of the school.  If the height of the wall is 8ft tall, what is the area of the largest possible mural?

50.24 ft²

200

A 15ft circular pool is being installed at a private home. However, the city requires a fence to go all around the pool for safety reasons.  How long is the fence?

47.1 ft

300

DOUBLE JEOPARDY

A circle is inscribed inside a square with an area of 400m².  What is the area of the circle?

400

A circular athletic track is being built.  It takes going around the track 4 full laps to walk a complete mile.  What is the radius of the track? Round to the nearest hundredth.

0.04mi

500

The distance from the center of Earth to the surface is around 3,965mi.  What is the distance to go completely around Earth once in a straight line?

24,900mi